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🔴 Sublunar | 🔵 Antipodal | █ Tidal Stress Belt (TSB)
Forecast Details

June 1838 San Andreas Erathquake, USA

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Status: INSIDE TSW

TSW Window: 1838-06-18T02:33:07Z to 1838-06-26T02:33:07Z

Syzygy Time: 1838-06-22T02:33:07Z

Perigee Time: N/A

Sublunar Latitude: 28.407735127°

Sublunar Longitude: 141.9357398772°

TSB Lower Latitude: 13.4077°

TSB Upper Latitude: 43.4077°

Radial Stress

Syzygy: 6.7378038298 kPa

Perigee: 0 kPa

Coulomb Stress

Syzygy: 4.0426822979 kPa

Perigee: 0 kPa

Target Faults

Philippine Plate / Mexico / Caribbean/ Red Sea Rift, San Andreas / Himalayan / Mediterranean, Kuril-Kamchatka / Cascadia / N. Japan

Alignments

Perigee In Tsw: No

Perihelion In Tsw: No

Mars In Tsw: Yes

Venus In Tsw: Yes

Super Tsw: Yes

Countries in High Seismic Zone

  • Nepal
  • Canada
  • Mexico
  • China
  • Tiwan
  • Russia
  • India
  • Greece
  • Northern USA
  • Spain
  • Thailand
  • Vietnam
  • Japan
  • Philippines
  • Turkey
  • Palestine
  • Pakistan
  • Southern USA
  • Saudi Arabia
  • Sudan

The June 1838 San Andreas earthquake is estimated to have had a magnitude of M 6.8 to 7.5. It ruptured the Santa Cruz Mountains and Peninsula sections of the San Andreas Fault. Witnesses at the time—largely from the missions and early ranchos—reported severe shaking that lasted for several minutes, causing significant damage from Monterey to San Francisco.

Our computed data focuses on the relationship between lunar/planetary positions and seismic stress. Here is a breakdown of what those metrics represent in this context:

The earthquake actually occurred around June 23, 1838. This fits remarkably well within our TSW Window (June 18–26) and is just one day after our noted Syzygy Time of June 22. This high degree of correlation is exactly what researchers look for when studying tidal triggering theories.

  • Syzygy & Stress: We’ve noted a Syzygy (alignment of Sun, Earth, and Moon) on June 22, 1838. This coincides with the tidal forces being at their peak. The Radial Stress (6.73 kPa) and Coulomb Stress (4.04 kPa) values you’ve listed represent the calculated “tidal trigger” force. While these stresses are small compared to the tectonic stress required to break a fault (which is in the Megapascal range), the theory suggests they can act as the “last straw” for a fault already at its failure point.
  • Sublunar Position: The sublunar latitude of 28.4°N puts the Moon’s gravitational pull directly over the northern subtropics. This aligns closely with the TSB (Tidal Stress Band) we identified between 13.4°N and 43.4°N, a zone that perfectly encapsulates the San Andreas Fault (~34°N to 38°N).
  • Planetary Alignments: The alignment of the Moon with Mars and Venus in the TSW, combined with a “Super TSW” status, suggests a period of maximized gravitational perturbation.

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